802.11e ============= .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is IEEE 802.11e?** IEEE 802.11e is an amendment to the Wi-Fi standard that provides Quality of Service (QoS) features to support time-sensitive applications like voice and video. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Why was 802.11e developed?** To enhance the original Wi-Fi standards with QoS mechanisms that prioritize different types of traffic for better performance. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What key feature does 802.11e introduce?** It introduces Enhanced Distributed Channel Access (EDCA) and Hybrid Coordination Function Controlled Channel Access (HCCA) for traffic prioritization. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is EDCA?** EDCA is a contention-based channel access method that provides prioritized medium access for different traffic categories. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is HCCA?** HCCA is a polling-based channel access method that allows a central coordinator to control transmissions for strict QoS. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Which OSI layer does 802.11e operate on?** It operates primarily at the Data Link Layer (Layer 2) focusing on MAC layer enhancements. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11e support voice over Wi-Fi?** Yes, it significantly improves the performance of voice and video applications by prioritizing their traffic. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Is 802.11e backward compatible?** Yes, devices supporting 802.11e can interoperate with earlier 802.11 standards. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Which traffic categories does 802.11e define?** It defines four Access Categories: Voice, Video, Best Effort, and Background. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does 802.11e improve Wi-Fi performance?** By enabling QoS, it reduces latency and jitter for critical applications, enhancing user experience. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11e support QoS in both infrastructure and ad hoc modes?** Yes, it supports QoS features in both infrastructure and peer-to-peer (ad hoc) modes. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Is 802.11e part of the Wi-Fi Multimedia (WMM) standard?** Yes, WMM is a certification based on 802.11e to ensure QoS interoperability. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What types of applications benefit from 802.11e?** Applications like VoIP, video conferencing, streaming media, and online gaming benefit from its QoS features. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11e require special hardware?** It requires compatible Wi-Fi chipsets and firmware that support QoS enhancements. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Can 802.11e coexist with non-QoS devices?** Yes, 802.11e devices can operate alongside legacy devices, though non-QoS devices won’t benefit from prioritization. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does 802.11e handle collisions and retransmissions?** It uses differentiated contention windows and arbitration inter-frame spacing to prioritize traffic and manage retransmissions. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Is 802.11e widely adopted?** Yes, QoS features based on 802.11e are widely implemented in modern Wi-Fi devices. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the difference between EDCA and HCCA?** EDCA is a distributed, contention-based access method for prioritized traffic, while HCCA is a centralized polling-based method offering stricter QoS guarantees. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11e improve battery life?** While its main goal is QoS, 802.11e includes mechanisms that can indirectly improve power efficiency by reducing retransmissions and idle times. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow Topics in this section, * :ref:`Learnings in this section <802_11e_step1>` * :ref:`Terminology <802_11e_step2>` * :ref:`Version Info <802_11e_step3>` * :ref:`802_11e Version&IEEE Details <802_11e_step4>` * :ref:`802_11e Basic Setup on Ubuntu using IPv4 <802_11e_step5>` * :ref:`802_11e Basic Setup on Ubuntu using IPv6 <802_11e_step6>` * :ref:`802_11e List of MAC features <802_11e_step7>` * :ref:`802_11e Medium Access Functions and their inner working <802_11e_step8>` * :ref:`802_11e Supported Frequency Bands in 802.11e <802_11e_step9>` * :ref:`802_11e List of Physical Features <802_11e_step10>` * :ref:`802_11e Power Saving Mechanisms in IEEE 802.11e <802_11e_step11>` * :ref:`802_11e Interoperability Mechanisms in IEEE 802.11e <802_11e_step12>` * :ref:`802_11e End-User Products that support 802.11e <802_11e_step13>` * :ref:`802_11e Protocol Packet Details <802_11e_step14>` * :ref:`802_11e Basic Features <802_11e_step15>` * :ref:`Reference links <802_11e_step16>` .. _802_11e_step1: .. tab-set:: .. tab-item:: Learnings in this section * In this section, you are going to learn .. _802_11e_step2: .. tab-set:: .. tab-item:: Terminology * Terminology .. _802_11e_step3: .. tab-set:: .. tab-item:: Version Info * Version Info .. _802_11e_step4: .. tab-set:: .. tab-item:: 802.11e Version&RFC Details * rfc details .. _802_11e_step5: .. tab-set:: .. tab-item:: 802.11e Basic Setup on Ubuntu using IPv4 * setup .. _802_11e_step6: .. tab-set:: .. tab-item:: 802.11e Basic Setup on Ubuntu using IPv6 * setup .. _802_11e_step7: .. tab-set:: .. tab-item:: 802.11e List of MAC features * mac features .. _802_11e_step8: .. tab-set:: .. tab-item:: 802.11e Medium Access Functions and their inner working * Medium Access Functions and their inner working .. _802_11e_step9: .. tab-set:: .. tab-item:: Supported Frequency Bands in 802.11e * Supported Frequency Bands in 802.11e .. _802_11e_step10: .. tab-set:: .. tab-item:: 802.11e List of Physical Features * List of Physical Features .. _802_11e_step11: .. tab-set:: .. tab-item:: Power Saving Mechanisms in IEEE 802.11e * Power Saving Mechanisms in IEEE 802.11e .. _802_11e_step12: .. tab-set:: .. tab-item:: Interoperability Mechanisms in IEEE 802.11e * Interoperability Mechanisms in IEEE 802.11e .. _802_11e_step13: .. tab-set:: .. tab-item:: End-User Products that support 802.11e * End-User Products that support 802.11e .. _802_11e_step14: .. tab-set:: .. tab-item:: Protocol Packet Details in 802.11e * Protocol Packet Details .. _802_11e_step15: .. tab-set:: .. tab-item:: Basic Features * Basic Features .. _802_11e_step16: .. tab-set:: .. tab-item:: Reference links * Reference links